====== Sleep spindles ======
Sleep spindles represent an oscillating electrical potential in the brain. They have a characteristic frequency of 11–16 Hz (usually 12–14 Hz in healthy adults) and last from one to several seconds in duration[(:cite:17557422>{{pmid>long:17557422}})]. On scalp electroencephalography (EEG), spindles are seen as sinusoidal waves that often have a fusiform or “crescendo-decrescendo” morphology[(:cite:14573378>{{pmid>long:14573378}})]. See {{ref>sleepspindles}}.
<figure center blank|sleepspindles>
{{sleepspindles.png}}
<figcaption>.Sleep spindles in a 3-month-old infant.Note well-developed sleep spindles in this 30-sec epoch from a PSG recorded on a 3-month-old infant. Sleep spindles between 3-4 months of age often last
5-8 sec and are maximal over Cz. Sensitivity 500 µV peak-to-peak, LFF 0.3 Hz, HFF 35 Hz.[(:cite:pmid22701392>{{pmid>long:22701392}})]</figcaption>
</figure>
===== References =====
~~REFNOTES~~